Subject: Re: ESP sync xfers & select/reselect status
To: Erik E. Fair <fair@clock.org>
From: der Mouse <mouse@Rodents.Montreal.QC.CA>
List: port-sparc
Date: 05/22/1997 18:30:43
> Who is running their systems with sync transfers turned on, and happy
> with it?  What disks are you using?

esp0 at sbus0 slot 0 offset 0x800000 pri 3: ESP100A 25Mhz, target 7
scsibus0 at esp0
sd0 at scsibus0 targ 0 lun 0: <SEAGATE, ST31200N, 8630> SCSI2 0/direct fixed
sd0: 1006MB, 2700 cyl, 9 head, 84 sec, 512 bytes/sec x 2061108 sectors
probe(esp0:1:0): max sync rate 4.80Mb/s
probe(esp0:1:0): target put in SYNC mode
sd1 at scsibus0 targ 1 lun 0: <FUJITSU, M2266S-512, 001F> SCSI2 0/direct fixed
sd1: 1029MB, 1658 cyl, 15 head, 84 sec, 512 bytes/sec x 2107704 sectors
sd2 at scsibus0 targ 2 lun 0: <SEAGATE, ST41600N, 0073> SCSI2 0/direct fixed
sd2: 1307MB, 2099 cyl, 17 head, 75 sec, 512 bytes/sec x 2676846 sectors

The machine is an IPC; sd0 is physically internal, the rest are in
external enclosures, with a separate terminator on the end of the
chain.  Why only sd1 runs sync, I have no idea - the others must be
refusing the negotiation or something.

The only time I have any trouble is if I use the trick of breaking to
ddb to freeze the scsi chain and then shuffling cables - often, after
doing this and "c"ontinuing from ddb, the next access to sd1 causes it
to renegotiate sync.  (This is not really a problem in practice.)

Why do you care?  (Just curious.)

					der Mouse

			       mouse@rodents.montreal.qc.ca
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